Описание
Improper Input Validation vulnerability in Apache Tomcat. Incorrect error handling for some invalid HTTP priority headers resulted in incomplete clean-up of the failed request which created a memory leak. A large number of such requests could trigger an OutOfMemoryException resulting in a denial of service.
This issue affects Apache Tomcat: from 9.0.76 through 9.0.102, from 10.1.10 through 10.1.39, from 11.0.0-M2 through 11.0.5.
Users are recommended to upgrade to version 9.0.104, 10.1.40 or 11.0.6 which fix the issue.
A flaw was found in Apache Tomcat. This vulnerability allows an application-level denial of service (DoS), causing it to become unresponsive or slow via maliciously crafted HTTP/2 prioritization headers. It performs an incomplete cleanup of failed requests, which triggers a memory leak.
Отчет
This is marked as Important vulnerability rather than a Moderate flaw because it introduces a reliable, unauthenticated denial-of-service (DoS) vector that exploits the core request-handling mechanism in Apache Tomcat. Specifically, the improper handling of invalid HTTP/2 Priority headers results in incomplete memory deallocation, creating a server-side memory leak. Unlike transient request errors that are gracefully handled and discarded, these malformed requests accumulate residual memory allocations over time. This means an attacker can trigger an OutOfMemoryException simply by sending a large volume of crafted HTTP/2 requests, effectively rendering the server non-functional without needing authentication or access to specific endpoints. Given that HTTP/2 is widely used in production environments to improve performance, this vulnerability targets a default, high-traffic pathway, making it more impactful.
Меры по смягчению последствий
Mitigation is either unavailable or does not meet Red Hat Product Security standards for usability, deployment, applicability, or stability.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 10 | tomcat | Not affected | ||
| Red Hat Enterprise Linux 10 | tomcat9 | Affected | ||
| Red Hat Enterprise Linux 6 | tomcat6 | Out of support scope | ||
| Red Hat Enterprise Linux 7 | tomcat | Out of support scope | ||
| Red Hat Enterprise Linux 8 | pki-deps:10.6/pki-servlet-engine | Not affected | ||
| Red Hat Enterprise Linux 8 | tomcat | Affected | ||
| Red Hat Enterprise Linux 9 | pki-servlet-engine | Not affected | ||
| Red Hat Enterprise Linux 9 | tomcat | Affected | ||
| Red Hat JBoss Web Server 5 | tomcat | Fixed | RHSA-2025:4522 | 08.05.2025 |
| Red Hat JBoss Web Server 5.8 on RHEL 7 | jws5-tomcat | Fixed | RHSA-2025:4521 | 08.05.2025 |
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Дополнительная информация
Статус:
7.5 High
CVSS3
Связанные уязвимости
Improper Input Validation vulnerability in Apache Tomcat. Incorrect error handling for some invalid HTTP priority headers resulted in incomplete clean-up of the failed request which created a memory leak. A large number of such requests could trigger an OutOfMemoryException resulting in a denial of service. This issue affects Apache Tomcat: from 9.0.76 through 9.0.102, from 10.1.10 through 10.1.39, from 11.0.0-M2 through 11.0.5. Users are recommended to upgrade to version 9.0.104, 10.1.40 or 11.0.6 which fix the issue.
Improper Input Validation vulnerability in Apache Tomcat. Incorrect error handling for some invalid HTTP priority headers resulted in incomplete clean-up of the failed request which created a memory leak. A large number of such requests could trigger an OutOfMemoryException resulting in a denial of service. This issue affects Apache Tomcat: from 9.0.76 through 9.0.102, from 10.1.10 through 10.1.39, from 11.0.0-M2 through 11.0.5. Users are recommended to upgrade to version 9.0.104, 10.1.40 or 11.0.6 which fix the issue.
Improper Input Validation vulnerability in Apache Tomcat. Incorrect er ...
Apache Tomcat Denial of Service via invalid HTTP priority header
Уязвимость сервера приложений Apache Tomcat, связанная с неполной очисткой временных или вспомогательных ресурсов, позволяющая нарушителю вызвать отказ в обслуживании
7.5 High
CVSS3